/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2005 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package clojure.asm;

import java.io.InputStream;
import java.io.IOException;

/**
 * A Java class parser to make a {@link ClassVisitor} visit an existing class.
 * This class parses a byte array conforming to the Java class file format and
 * calls the appropriate visit methods of a given class visitor for each field,
 * method and bytecode instruction encountered.
 *
 * @author Eric Bruneton
 * @author Eugene Kuleshov
 */
public class ClassReader{

/**
 * Flag to skip method code. If this class is set <code>CODE</code>
 * attribute won't be visited. This can be used, for example, to retrieve
 * annotations for methods and method parameters.
 */
public final static int SKIP_CODE = 1;

/**
 * Flag to skip the debug information in the class. If this flag is set the
 * debug information of the class is not visited, i.e. the
 * {@link MethodVisitor#visitLocalVariable visitLocalVariable} and
 * {@link MethodVisitor#visitLineNumber visitLineNumber} methods will not be
 * called.
 */
public final static int SKIP_DEBUG = 2;

/**
 * Flag to skip the stack map frames in the class. If this flag is set the
 * stack map frames of the class is not visited, i.e. the
 * {@link MethodVisitor#visitFrame visitFrame} method will not be called.
 * This flag is useful when the {@link ClassWriter#COMPUTE_FRAMES} option is
 * used: it avoids visiting frames that will be ignored and recomputed from
 * scratch in the class writer.
 */
public final static int SKIP_FRAMES = 4;

/**
 * Flag to expand the stack map frames. By default stack map frames are
 * visited in their original format (i.e. "expanded" for classes whose
 * version is less than V1_6, and "compressed" for the other classes). If
 * this flag is set, stack map frames are always visited in expanded format
 * (this option adds a decompression/recompression step in ClassReader and
 * ClassWriter which degrades performances quite a lot).
 */
public final static int EXPAND_FRAMES = 8;

/**
 * The class to be parsed. <i>The content of this array must not be
 * modified. This field is intended for {@link Attribute} sub classes, and
 * is normally not needed by class generators or adapters.</i>
 */
public final byte[] b;

/**
 * The start index of each constant pool item in {@link #b b}, plus one.
 * The one byte offset skips the constant pool item tag that indicates its
 * type.
 */
private final int[] items;

/**
 * The String objects corresponding to the CONSTANT_Utf8 items. This cache
 * avoids multiple parsing of a given CONSTANT_Utf8 constant pool item,
 * which GREATLY improves performances (by a factor 2 to 3). This caching
 * strategy could be extended to all constant pool items, but its benefit
 * would not be so great for these items (because they are much less
 * expensive to parse than CONSTANT_Utf8 items).
 */
private final String[] strings;

/**
 * Maximum length of the strings contained in the constant pool of the
 * class.
 */
private final int maxStringLength;

/**
 * Start index of the class header information (access, name...) in
 * {@link #b b}.
 */
public final int header;

// ------------------------------------------------------------------------
// Constructors
// ------------------------------------------------------------------------

/**
 * Constructs a new {@link ClassReader} object.
 *
 * @param b the bytecode of the class to be read.
 */
public ClassReader(final byte[] b){
	this(b, 0, b.length);
}

/**
 * Constructs a new {@link ClassReader} object.
 *
 * @param b   the bytecode of the class to be read.
 * @param off the start offset of the class data.
 * @param len the length of the class data.
 */
public ClassReader(final byte[] b, final int off, final int len){
	this.b = b;
	// parses the constant pool
	items = new int[readUnsignedShort(off + 8)];
	int n = items.length;
	strings = new String[n];
	int max = 0;
	int index = off + 10;
	for(int i = 1; i < n; ++i)
		{
		items[i] = index + 1;
		int size;
		switch(b[index])
			{
			case ClassWriter.FIELD:
			case ClassWriter.METH:
			case ClassWriter.IMETH:
			case ClassWriter.INT:
			case ClassWriter.FLOAT:
			case ClassWriter.NAME_TYPE:
				size = 5;
				break;
			case ClassWriter.LONG:
			case ClassWriter.DOUBLE:
				size = 9;
				++i;
				break;
			case ClassWriter.UTF8:
				size = 3 + readUnsignedShort(index + 1);
				if(size > max)
					{
					max = size;
					}
				break;
				// case ClassWriter.CLASS:
				// case ClassWriter.STR:
			default:
				size = 3;
				break;
			}
		index += size;
		}
	maxStringLength = max;
	// the class header information starts just after the constant pool
	header = index;
}

/**
 * Returns the class's access flags (see {@link Opcodes}). This value may
 * not reflect Deprecated and Synthetic flags when bytecode is before 1.5
 * and those flags are represented by attributes.
 *
 * @return the class access flags
 * @see ClassVisitor#visit(int,int,String,String,String,String[])
 */
public int getAccess(){
	return readUnsignedShort(header);
}

/**
 * Returns the internal name of the class (see
 * {@link Type#getInternalName() getInternalName}).
 *
 * @return the internal class name
 * @see ClassVisitor#visit(int,int,String,String,String,String[])
 */
public String getClassName(){
	return readClass(header + 2, new char[maxStringLength]);
}

/**
 * Returns the internal of name of the super class (see
 * {@link Type#getInternalName() getInternalName}). For interfaces, the
 * super class is {@link Object}.
 *
 * @return the internal name of super class, or <tt>null</tt> for
 *         {@link Object} class.
 * @see ClassVisitor#visit(int,int,String,String,String,String[])
 */
public String getSuperName(){
	int n = items[readUnsignedShort(header + 4)];
	return n == 0 ? null : readUTF8(n, new char[maxStringLength]);
}

/**
 * Returns the internal names of the class's interfaces (see
 * {@link Type#getInternalName() getInternalName}).
 *
 * @return the array of internal names for all implemented interfaces or
 *         <tt>null</tt>.
 * @see ClassVisitor#visit(int,int,String,String,String,String[])
 */
public String[] getInterfaces(){
	int index = header + 6;
	int n = readUnsignedShort(index);
	String[] interfaces = new String[n];
	if(n > 0)
		{
		char[] buf = new char[maxStringLength];
		for(int i = 0; i < n; ++i)
			{
			index += 2;
			interfaces[i] = readClass(index, buf);
			}
		}
	return interfaces;
}

/**
 * Copies the constant pool data into the given {@link ClassWriter}. Should
 * be called before the {@link #accept(ClassVisitor,int)} method.
 *
 * @param classWriter the {@link ClassWriter} to copy constant pool into.
 */
void copyPool(final ClassWriter classWriter){
	char[] buf = new char[maxStringLength];
	int ll = items.length;
	Item[] items2 = new Item[ll];
	for(int i = 1; i < ll; i++)
		{
		int index = items[i];
		int tag = b[index - 1];
		Item item = new Item(i);
		int nameType;
		switch(tag)
			{
			case ClassWriter.FIELD:
			case ClassWriter.METH:
			case ClassWriter.IMETH:
				nameType = items[readUnsignedShort(index + 2)];
				item.set(tag,
				         readClass(index, buf),
				         readUTF8(nameType, buf),
				         readUTF8(nameType + 2, buf));
				break;

			case ClassWriter.INT:
				item.set(readInt(index));
				break;

			case ClassWriter.FLOAT:
				item.set(Float.intBitsToFloat(readInt(index)));
				break;

			case ClassWriter.NAME_TYPE:
				item.set(tag,
				         readUTF8(index, buf),
				         readUTF8(index + 2, buf),
				         null);
				break;

			case ClassWriter.LONG:
				item.set(readLong(index));
				++i;
				break;

			case ClassWriter.DOUBLE:
				item.set(Double.longBitsToDouble(readLong(index)));
				++i;
				break;

			case ClassWriter.UTF8:
			{
			String s = strings[i];
			if(s == null)
				{
				index = items[i];
				s = strings[i] = readUTF(index + 2,
				                         readUnsignedShort(index),
				                         buf);
				}
			item.set(tag, s, null, null);
			}
			break;

			// case ClassWriter.STR:
			// case ClassWriter.CLASS:
			default:
				item.set(tag, readUTF8(index, buf), null, null);
				break;
			}

		int index2 = item.hashCode % items2.length;
		item.next = items2[index2];
		items2[index2] = item;
		}

	int off = items[1] - 1;
	classWriter.pool.putByteArray(b, off, header - off);
	classWriter.items = items2;
	classWriter.threshold = (int) (0.75d * ll);
	classWriter.index = ll;
}

/**
 * Constructs a new {@link ClassReader} object.
 *
 * @param is an input stream from which to read the class.
 * @throws IOException if a problem occurs during reading.
 */
public ClassReader(final InputStream is) throws IOException{
	this(readClass(is));
}

/**
 * Constructs a new {@link ClassReader} object.
 *
 * @param name the fully qualified name of the class to be read.
 * @throws IOException if an exception occurs during reading.
 */
public ClassReader(final String name) throws IOException{
	this(ClassLoader.getSystemResourceAsStream(name.replace('.', '/')
	                                           + ".class"));
}

/**
 * Reads the bytecode of a class.
 *
 * @param is an input stream from which to read the class.
 * @return the bytecode read from the given input stream.
 * @throws IOException if a problem occurs during reading.
 */
private static byte[] readClass(final InputStream is) throws IOException{
	if(is == null)
		{
		throw new IOException("Class not found");
		}
	byte[] b = new byte[is.available()];
	int len = 0;
	while(true)
		{
		int n = is.read(b, len, b.length - len);
		if(n == -1)
			{
			if(len < b.length)
				{
				byte[] c = new byte[len];
				System.arraycopy(b, 0, c, 0, len);
				b = c;
				}
			return b;
			}
		len += n;
		if(len == b.length)
			{
			byte[] c = new byte[b.length + 1000];
			System.arraycopy(b, 0, c, 0, len);
			b = c;
			}
		}
}

// ------------------------------------------------------------------------
// Public methods
// ------------------------------------------------------------------------

/**
 * Makes the given visitor visit the Java class of this {@link ClassReader}.
 * This class is the one specified in the constructor (see
 * {@link #ClassReader(byte[]) ClassReader}).
 *
 * @param classVisitor the visitor that must visit this class.
 * @param flags        option flags that can be used to modify the default behavior
 *                     of this class. See {@link #SKIP_DEBUG}, {@link #EXPAND_FRAMES}.
 */
public void accept(final ClassVisitor classVisitor, final int flags){
	accept(classVisitor, new Attribute[0], flags);
}

/**
 * Makes the given visitor visit the Java class of this {@link ClassReader}.
 * This class is the one specified in the constructor (see
 * {@link #ClassReader(byte[]) ClassReader}).
 *
 * @param classVisitor the visitor that must visit this class.
 * @param attrs        prototypes of the attributes that must be parsed during the
 *                     visit of the class. Any attribute whose type is not equal to the
 *                     type of one the prototypes will not be parsed: its byte array
 *                     value will be passed unchanged to the ClassWriter. <i>This may
 *                     corrupt it if this value contains references to the constant pool,
 *                     or has syntactic or semantic links with a class element that has
 *                     been transformed by a class adapter between the reader and the
 *                     writer</i>.
 * @param flags        option flags that can be used to modify the default behavior
 *                     of this class. See {@link #SKIP_DEBUG}, {@link #EXPAND_FRAMES}.
 */
public void accept(
		final ClassVisitor classVisitor,
		final Attribute[] attrs,
		final int flags){
	byte[] b = this.b; // the bytecode array
	char[] c = new char[maxStringLength]; // buffer used to read strings
	int i, j, k; // loop variables
	int u, v, w; // indexes in b
	Attribute attr;

	int access;
	String name;
	String desc;
	String attrName;
	String signature;
	int anns = 0;
	int ianns = 0;
	Attribute cattrs = null;

	// visits the header
	u = header;
	access = readUnsignedShort(u);
	name = readClass(u + 2, c);
	v = items[readUnsignedShort(u + 4)];
	String superClassName = v == 0 ? null : readUTF8(v, c);
	String[] implementedItfs = new String[readUnsignedShort(u + 6)];
	w = 0;
	u += 8;
	for(i = 0; i < implementedItfs.length; ++i)
		{
		implementedItfs[i] = readClass(u, c);
		u += 2;
		}

	boolean skipCode = (flags & SKIP_CODE) != 0;
	boolean skipDebug = (flags & SKIP_DEBUG) != 0;
	boolean unzip = (flags & EXPAND_FRAMES) != 0;

	// skips fields and methods
	v = u;
	i = readUnsignedShort(v);
	v += 2;
	for(; i > 0; --i)
		{
		j = readUnsignedShort(v + 6);
		v += 8;
		for(; j > 0; --j)
			{
			v += 6 + readInt(v + 2);
			}
		}
	i = readUnsignedShort(v);
	v += 2;
	for(; i > 0; --i)
		{
		j = readUnsignedShort(v + 6);
		v += 8;
		for(; j > 0; --j)
			{
			v += 6 + readInt(v + 2);
			}
		}
	// reads the class's attributes
	signature = null;
	String sourceFile = null;
	String sourceDebug = null;
	String enclosingOwner = null;
	String enclosingName = null;
	String enclosingDesc = null;

	i = readUnsignedShort(v);
	v += 2;
	for(; i > 0; --i)
		{
		attrName = readUTF8(v, c);
		// tests are sorted in decreasing frequency order
		// (based on frequencies observed on typical classes)
		if(attrName.equals("SourceFile"))
			{
			sourceFile = readUTF8(v + 6, c);
			}
		else if(attrName.equals("InnerClasses"))
			{
			w = v + 6;
			}
		else if(attrName.equals("EnclosingMethod"))
			{
			enclosingOwner = readClass(v + 6, c);
			int item = readUnsignedShort(v + 8);
			if(item != 0)
				{
				enclosingName = readUTF8(items[item], c);
				enclosingDesc = readUTF8(items[item] + 2, c);
				}
			}
		else if(attrName.equals("Signature"))
			{
			signature = readUTF8(v + 6, c);
			}
		else if(attrName.equals("RuntimeVisibleAnnotations"))
			{
			anns = v + 6;
			}
		else if(attrName.equals("Deprecated"))
			{
			access |= Opcodes.ACC_DEPRECATED;
			}
		else if(attrName.equals("Synthetic"))
			{
			access |= Opcodes.ACC_SYNTHETIC;
			}
		else if(attrName.equals("SourceDebugExtension"))
			{
			int len = readInt(v + 2);
			sourceDebug = readUTF(v + 6, len, new char[len]);
			}
		else if(attrName.equals("RuntimeInvisibleAnnotations"))
			{
			ianns = v + 6;
			}
		else
			{
			attr = readAttribute(attrs,
			                     attrName,
			                     v + 6,
			                     readInt(v + 2),
			                     c,
			                     -1,
			                     null);
			if(attr != null)
				{
				attr.next = cattrs;
				cattrs = attr;
				}
			}
		v += 6 + readInt(v + 2);
		}
	// calls the visit method
	classVisitor.visit(readInt(4),
	                   access,
	                   name,
	                   signature,
	                   superClassName,
	                   implementedItfs);

	// calls the visitSource method
	if(!skipDebug && (sourceFile != null || sourceDebug != null))
		{
		classVisitor.visitSource(sourceFile, sourceDebug);
		}

	// calls the visitOuterClass method
	if(enclosingOwner != null)
		{
		classVisitor.visitOuterClass(enclosingOwner,
		                             enclosingName,
		                             enclosingDesc);
		}

	// visits the class annotations
	for(i = 1; i >= 0; --i)
		{
		v = i == 0 ? ianns : anns;
		if(v != 0)
			{
			j = readUnsignedShort(v);
			v += 2;
			for(; j > 0; --j)
				{
				v = readAnnotationValues(v + 2,
				                         c,
				                         true,
				                         classVisitor.visitAnnotation(readUTF8(v, c), i != 0));
				}
			}
		}

	// visits the class attributes
	while(cattrs != null)
		{
		attr = cattrs.next;
		cattrs.next = null;
		classVisitor.visitAttribute(cattrs);
		cattrs = attr;
		}

	// calls the visitInnerClass method
	if(w != 0)
		{
		i = readUnsignedShort(w);
		w += 2;
		for(; i > 0; --i)
			{
			classVisitor.visitInnerClass(readUnsignedShort(w) == 0
			                             ? null
			                             : readClass(w, c), readUnsignedShort(w + 2) == 0
			                                                ? null
			                                                : readClass(w + 2, c), readUnsignedShort(w + 4) == 0
			                                                                       ? null
			                                                                       : readUTF8(w + 4, c),
			                                                                       readUnsignedShort(w + 6));
			w += 8;
			}
		}

	// visits the fields
	i = readUnsignedShort(u);
	u += 2;
	for(; i > 0; --i)
		{
		access = readUnsignedShort(u);
		name = readUTF8(u + 2, c);
		desc = readUTF8(u + 4, c);
		// visits the field's attributes and looks for a ConstantValue
		// attribute
		int fieldValueItem = 0;
		signature = null;
		anns = 0;
		ianns = 0;
		cattrs = null;

		j = readUnsignedShort(u + 6);
		u += 8;
		for(; j > 0; --j)
			{
			attrName = readUTF8(u, c);
			// tests are sorted in decreasing frequency order
			// (based on frequencies observed on typical classes)
			if(attrName.equals("ConstantValue"))
				{
				fieldValueItem = readUnsignedShort(u + 6);
				}
			else if(attrName.equals("Signature"))
				{
				signature = readUTF8(u + 6, c);
				}
			else if(attrName.equals("Deprecated"))
				{
				access |= Opcodes.ACC_DEPRECATED;
				}
			else if(attrName.equals("Synthetic"))
				{
				access |= Opcodes.ACC_SYNTHETIC;
				}
			else if(attrName.equals("RuntimeVisibleAnnotations"))
				{
				anns = u + 6;
				}
			else if(attrName.equals("RuntimeInvisibleAnnotations"))
				{
				ianns = u + 6;
				}
			else
				{
				attr = readAttribute(attrs,
				                     attrName,
				                     u + 6,
				                     readInt(u + 2),
				                     c,
				                     -1,
				                     null);
				if(attr != null)
					{
					attr.next = cattrs;
					cattrs = attr;
					}
				}
			u += 6 + readInt(u + 2);
			}
		// visits the field
		FieldVisitor fv = classVisitor.visitField(access,
		                                          name,
		                                          desc,
		                                          signature,
		                                          fieldValueItem == 0 ? null : readConst(fieldValueItem, c));
		// visits the field annotations and attributes
		if(fv != null)
			{
			for(j = 1; j >= 0; --j)
				{
				v = j == 0 ? ianns : anns;
				if(v != 0)
					{
					k = readUnsignedShort(v);
					v += 2;
					for(; k > 0; --k)
						{
						v = readAnnotationValues(v + 2,
						                         c,
						                         true,
						                         fv.visitAnnotation(readUTF8(v, c), j != 0));
						}
					}
				}
			while(cattrs != null)
				{
				attr = cattrs.next;
				cattrs.next = null;
				fv.visitAttribute(cattrs);
				cattrs = attr;
				}
			fv.visitEnd();
			}
		}

	// visits the methods
	i = readUnsignedShort(u);
	u += 2;
	for(; i > 0; --i)
		{
		int u0 = u + 6;
		access = readUnsignedShort(u);
		name = readUTF8(u + 2, c);
		desc = readUTF8(u + 4, c);
		signature = null;
		anns = 0;
		ianns = 0;
		int dann = 0;
		int mpanns = 0;
		int impanns = 0;
		cattrs = null;
		v = 0;
		w = 0;

		// looks for Code and Exceptions attributes
		j = readUnsignedShort(u + 6);
		u += 8;
		for(; j > 0; --j)
			{
			attrName = readUTF8(u, c);
			int attrSize = readInt(u + 2);
			u += 6;
			// tests are sorted in decreasing frequency order
			// (based on frequencies observed on typical classes)
			if(attrName.equals("Code"))
				{
				if(!skipCode)
					{
					v = u;
					}
				}
			else if(attrName.equals("Exceptions"))
				{
				w = u;
				}
			else if(attrName.equals("Signature"))
				{
				signature = readUTF8(u, c);
				}
			else if(attrName.equals("Deprecated"))
				{
				access |= Opcodes.ACC_DEPRECATED;
				}
			else if(attrName.equals("RuntimeVisibleAnnotations"))
				{
				anns = u;
				}
			else if(attrName.equals("AnnotationDefault"))
				{
				dann = u;
				}
			else if(attrName.equals("Synthetic"))
				{
				access |= Opcodes.ACC_SYNTHETIC;
				}
			else if(attrName.equals("RuntimeInvisibleAnnotations"))
				{
				ianns = u;
				}
			else if(attrName.equals("RuntimeVisibleParameterAnnotations"))
				{
				mpanns = u;
				}
			else if(attrName.equals("RuntimeInvisibleParameterAnnotations"))
				{
				impanns = u;
				}
			else
				{
				attr = readAttribute(attrs,
				                     attrName,
				                     u,
				                     attrSize,
				                     c,
				                     -1,
				                     null);
				if(attr != null)
					{
					attr.next = cattrs;
					cattrs = attr;
					}
				}
			u += attrSize;
			}
		// reads declared exceptions
		String[] exceptions;
		if(w == 0)
			{
			exceptions = null;
			}
		else
			{
			exceptions = new String[readUnsignedShort(w)];
			w += 2;
			for(j = 0; j < exceptions.length; ++j)
				{
				exceptions[j] = readClass(w, c);
				w += 2;
				}
			}

		// visits the method's code, if any
		MethodVisitor mv = classVisitor.visitMethod(access,
		                                            name,
		                                            desc,
		                                            signature,
		                                            exceptions);

		if(mv != null)
			{
			/*
							 * if the returned MethodVisitor is in fact a MethodWriter, it
							 * means there is no method adapter between the reader and the
							 * writer. If, in addition, the writer's constant pool was
							 * copied from this reader (mw.cw.cr == this), and the signature
							 * and exceptions of the method have not been changed, then it
							 * is possible to skip all visit events and just copy the
							 * original code of the method to the writer (the access, name
							 * and descriptor can have been changed, this is not important
							 * since they are not copied as is from the reader).
							 */
			if(mv instanceof MethodWriter)
				{
				MethodWriter mw = (MethodWriter) mv;
				if(mw.cw.cr == this)
					{
					if(signature == mw.signature)
						{
						boolean sameExceptions = false;
						if(exceptions == null)
							{
							sameExceptions = mw.exceptionCount == 0;
							}
						else
							{
							if(exceptions.length == mw.exceptionCount)
								{
								sameExceptions = true;
								for(j = exceptions.length - 1; j >= 0; --j)
									{
									w -= 2;
									if(mw.exceptions[j] != readUnsignedShort(w))
										{
										sameExceptions = false;
										break;
										}
									}
								}
							}
						if(sameExceptions)
							{
							/*
															 * we do not copy directly the code into
															 * MethodWriter to save a byte array copy
															 * operation. The real copy will be done in
															 * ClassWriter.toByteArray().
															 */
							mw.classReaderOffset = u0;
							mw.classReaderLength = u - u0;
							continue;
							}
						}
					}
				}

			if(dann != 0)
				{
				AnnotationVisitor dv = mv.visitAnnotationDefault();
				readAnnotationValue(dann, c, null, dv);
				if(dv != null)
					{
					dv.visitEnd();
					}
				}
			for(j = 1; j >= 0; --j)
				{
				w = j == 0 ? ianns : anns;
				if(w != 0)
					{
					k = readUnsignedShort(w);
					w += 2;
					for(; k > 0; --k)
						{
						w = readAnnotationValues(w + 2,
						                         c,
						                         true,
						                         mv.visitAnnotation(readUTF8(w, c), j != 0));
						}
					}
				}
			if(mpanns != 0)
				{
				readParameterAnnotations(mpanns, c, true, mv);
				}
			if(impanns != 0)
				{
				readParameterAnnotations(impanns, c, false, mv);
				}
			while(cattrs != null)
				{
				attr = cattrs.next;
				cattrs.next = null;
				mv.visitAttribute(cattrs);
				cattrs = attr;
				}
			}

		if(mv != null && v != 0)
			{
			int maxStack = readUnsignedShort(v);
			int maxLocals = readUnsignedShort(v + 2);
			int codeLength = readInt(v + 4);
			v += 8;

			int codeStart = v;
			int codeEnd = v + codeLength;

			mv.visitCode();

			// 1st phase: finds the labels
			int label;
			Label[] labels = new Label[codeLength + 1];
			while(v < codeEnd)
				{
				int opcode = b[v] & 0xFF;
				switch(ClassWriter.TYPE[opcode])
					{
					case ClassWriter.NOARG_INSN:
					case ClassWriter.IMPLVAR_INSN:
						v += 1;
						break;
					case ClassWriter.LABEL_INSN:
						label = v - codeStart + readShort(v + 1);
						if(labels[label] == null)
							{
							labels[label] = new Label();
							}
						v += 3;
						break;
					case ClassWriter.LABELW_INSN:
						label = v - codeStart + readInt(v + 1);
						if(labels[label] == null)
							{
							labels[label] = new Label();
							}
						v += 5;
						break;
					case ClassWriter.WIDE_INSN:
						opcode = b[v + 1] & 0xFF;
						if(opcode == Opcodes.IINC)
							{
							v += 6;
							}
						else
							{
							v += 4;
							}
						break;
					case ClassWriter.TABL_INSN:
						// skips 0 to 3 padding bytes
						w = v - codeStart;
						v = v + 4 - (w & 3);
						// reads instruction
						label = w + readInt(v);
						if(labels[label] == null)
							{
							labels[label] = new Label();
							}
						j = readInt(v + 8) - readInt(v + 4) + 1;
						v += 12;
						for(; j > 0; --j)
							{
							label = w + readInt(v);
							v += 4;
							if(labels[label] == null)
								{
								labels[label] = new Label();
								}
							}
						break;
					case ClassWriter.LOOK_INSN:
						// skips 0 to 3 padding bytes
						w = v - codeStart;
						v = v + 4 - (w & 3);
						// reads instruction
						label = w + readInt(v);
						if(labels[label] == null)
							{
							labels[label] = new Label();
							}
						j = readInt(v + 4);
						v += 8;
						for(; j > 0; --j)
							{
							label = w + readInt(v + 4);
							v += 8;
							if(labels[label] == null)
								{
								labels[label] = new Label();
								}
							}
						break;
					case ClassWriter.VAR_INSN:
					case ClassWriter.SBYTE_INSN:
					case ClassWriter.LDC_INSN:
						v += 2;
						break;
					case ClassWriter.SHORT_INSN:
					case ClassWriter.LDCW_INSN:
					case ClassWriter.FIELDORMETH_INSN:
					case ClassWriter.TYPE_INSN:
					case ClassWriter.IINC_INSN:
						v += 3;
						break;
					case ClassWriter.ITFMETH_INSN:
						v += 5;
						break;
						// case MANA_INSN:
					default:
						v += 4;
						break;
					}
				}
			// parses the try catch entries
			j = readUnsignedShort(v);
			v += 2;
			for(; j > 0; --j)
				{
				label = readUnsignedShort(v);
				Label start = labels[label];
				if(start == null)
					{
					labels[label] = start = new Label();
					}
				label = readUnsignedShort(v + 2);
				Label end = labels[label];
				if(end == null)
					{
					labels[label] = end = new Label();
					}
				label = readUnsignedShort(v + 4);
				Label handler = labels[label];
				if(handler == null)
					{
					labels[label] = handler = new Label();
					}
				int type = readUnsignedShort(v + 6);
				if(type == 0)
					{
					mv.visitTryCatchBlock(start, end, handler, null);
					}
				else
					{
					mv.visitTryCatchBlock(start,
					                      end,
					                      handler,
					                      readUTF8(items[type], c));
					}
				v += 8;
				}
			// parses the local variable, line number tables, and code
			// attributes
			int varTable = 0;
			int varTypeTable = 0;
			int stackMap = 0;
			int frameCount = 0;
			int frameMode = 0;
			int frameOffset = 0;
			int frameLocalCount = 0;
			int frameLocalDiff = 0;
			int frameStackCount = 0;
			Object[] frameLocal = null;
			Object[] frameStack = null;
			boolean zip = true;
			cattrs = null;
			j = readUnsignedShort(v);
			v += 2;
			for(; j > 0; --j)
				{
				attrName = readUTF8(v, c);
				if(attrName.equals("LocalVariableTable"))
					{
					if(!skipDebug)
						{
						varTable = v + 6;
						k = readUnsignedShort(v + 6);
						w = v + 8;
						for(; k > 0; --k)
							{
							label = readUnsignedShort(w);
							if(labels[label] == null)
								{
								labels[label] = new Label(true);
								}
							label += readUnsignedShort(w + 2);
							if(labels[label] == null)
								{
								labels[label] = new Label(true);
								}
							w += 10;
							}
						}
					}
				else if(attrName.equals("LocalVariableTypeTable"))
					{
					varTypeTable = v + 6;
					}
				else if(attrName.equals("LineNumberTable"))
					{
					if(!skipDebug)
						{
						k = readUnsignedShort(v + 6);
						w = v + 8;
						for(; k > 0; --k)
							{
							label = readUnsignedShort(w);
							if(labels[label] == null)
								{
								labels[label] = new Label(true);
								}
							labels[label].line = readUnsignedShort(w + 2);
							w += 4;
							}
						}
					}
				else if(attrName.equals("StackMapTable"))
					{
					if((flags & SKIP_FRAMES) == 0)
						{
						stackMap = v + 8;
						frameCount = readUnsignedShort(v + 6);
						}
					/*
											 * here we do not extract the labels corresponding to
											 * the attribute content. This would require a full
											 * parsing of the attribute, which would need to be
											 * repeated in the second phase (see below). Instead the
											 * content of the attribute is read one frame at a time
											 * (i.e. after a frame has been visited, the next frame
											 * is read), and the labels it contains are also
											 * extracted one frame at a time. Thanks to the ordering
											 * of frames, having only a "one frame lookahead" is not
											 * a problem, i.e. it is not possible to see an offset
											 * smaller than the offset of the current insn and for
											 * which no Label exist.
											 */
					// TODO true for frame offsets,
					// but for UNINITIALIZED type offsets?
					}
				else if(attrName.equals("StackMap"))
					{
					if((flags & SKIP_FRAMES) == 0)
						{
						stackMap = v + 8;
						frameCount = readUnsignedShort(v + 6);
						zip = false;
						}
					/*
											 * IMPORTANT! here we assume that the frames are
											 * ordered, as in the StackMapTable attribute, although
											 * this is not guaranteed by the attribute format.
											 */
					}
				else
					{
					for(k = 0; k < attrs.length; ++k)
						{
						if(attrs[k].type.equals(attrName))
							{
							attr = attrs[k].read(this,
							                     v + 6,
							                     readInt(v + 2),
							                     c,
							                     codeStart - 8,
							                     labels);
							if(attr != null)
								{
								attr.next = cattrs;
								cattrs = attr;
								}
							}
						}
					}
				v += 6 + readInt(v + 2);
				}

			// 2nd phase: visits each instruction
			if(stackMap != 0)
				{
				// creates the very first (implicit) frame from the method
				// descriptor
				frameLocal = new Object[maxLocals];
				frameStack = new Object[maxStack];
				if(unzip)
					{
					int local = 0;
					if((access & Opcodes.ACC_STATIC) == 0)
						{
						if(name.equals("<init>"))
							{
							frameLocal[local++] = Opcodes.UNINITIALIZED_THIS;
							}
						else
							{
							frameLocal[local++] = readClass(header + 2, c);
							}
						}
					j = 1;
					loop:
					while(true)
						{
						k = j;
						switch(desc.charAt(j++))
							{
							case'Z':
							case'C':
							case'B':
							case'S':
							case'I':
								frameLocal[local++] = Opcodes.INTEGER;
								break;
							case'F':
								frameLocal[local++] = Opcodes.FLOAT;
								break;
							case'J':
								frameLocal[local++] = Opcodes.LONG;
								break;
							case'D':
								frameLocal[local++] = Opcodes.DOUBLE;
								break;
							case'[':
								while(desc.charAt(j) == '[')
									{
									++j;
									}
								if(desc.charAt(j) == 'L')
									{
									++j;
									while(desc.charAt(j) != ';')
										{
										++j;
										}
									}
								frameLocal[local++] = desc.substring(k, ++j);
								break;
							case'L':
								while(desc.charAt(j) != ';')
									{
									++j;
									}
								frameLocal[local++] = desc.substring(k + 1,
								                                     j++);
								break;
							default:
								break loop;
							}
						}
					frameLocalCount = local;
					}
				/*
									 * for the first explicit frame the offset is not
									 * offset_delta + 1 but only offset_delta; setting the
									 * implicit frame offset to -1 allow the use of the
									 * "offset_delta + 1" rule in all cases
									 */
				frameOffset = -1;
				}
			v = codeStart;
			Label l;
			while(v < codeEnd)
				{
				w = v - codeStart;

				l = labels[w];
				if(l != null)
					{
					mv.visitLabel(l);
					if(!skipDebug && l.line > 0)
						{
						mv.visitLineNumber(l.line, l);
						}
					}

				while(frameLocal != null
				      && (frameOffset == w || frameOffset == -1))
					{
					// if there is a frame for this offset,
					// makes the visitor visit it,
					// and reads the next frame if there is one.
					if(!zip || unzip)
						{
						mv.visitFrame(Opcodes.F_NEW,
						              frameLocalCount,
						              frameLocal,
						              frameStackCount,
						              frameStack);
						}
					else if(frameOffset != -1)
						{
						mv.visitFrame(frameMode,
						              frameLocalDiff,
						              frameLocal,
						              frameStackCount,
						              frameStack);
						}

					if(frameCount > 0)
						{
						int tag, delta, n;
						if(zip)
							{
							tag = b[stackMap++] & 0xFF;
							}
						else
							{
							tag = MethodWriter.FULL_FRAME;
							frameOffset = -1;
							}
						frameLocalDiff = 0;
						if(tag < MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME)
							{
							delta = tag;
							frameMode = Opcodes.F_SAME;
							frameStackCount = 0;
							}
						else if(tag < MethodWriter.RESERVED)
							{
							delta = tag
							        - MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME;
							stackMap = readFrameType(frameStack,
							                         0,
							                         stackMap,
							                         c,
							                         labels);
							frameMode = Opcodes.F_SAME1;
							frameStackCount = 1;
							}
						else
							{
							delta = readUnsignedShort(stackMap);
							stackMap += 2;
							if(tag == MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED)
								{
								stackMap = readFrameType(frameStack,
								                         0,
								                         stackMap,
								                         c,
								                         labels);
								frameMode = Opcodes.F_SAME1;
								frameStackCount = 1;
								}
							else if(tag >= MethodWriter.CHOP_FRAME
							        && tag < MethodWriter.SAME_FRAME_EXTENDED)
								{
								frameMode = Opcodes.F_CHOP;
								frameLocalDiff = MethodWriter.SAME_FRAME_EXTENDED
								                 - tag;
								frameLocalCount -= frameLocalDiff;
								frameStackCount = 0;
								}
							else if(tag == MethodWriter.SAME_FRAME_EXTENDED)
								{
								frameMode = Opcodes.F_SAME;
								frameStackCount = 0;
								}
							else if(tag < MethodWriter.FULL_FRAME)
								{
								j = unzip ? frameLocalCount : 0;
								for(k = tag
								        - MethodWriter.SAME_FRAME_EXTENDED; k > 0; k--)
									{
									stackMap = readFrameType(frameLocal,
									                         j++,
									                         stackMap,
									                         c,
									                         labels);
									}
								frameMode = Opcodes.F_APPEND;
								frameLocalDiff = tag
								                 - MethodWriter.SAME_FRAME_EXTENDED;
								frameLocalCount += frameLocalDiff;
								frameStackCount = 0;
								}
							else
								{ // if (tag == FULL_FRAME) {
								frameMode = Opcodes.F_FULL;
								n = frameLocalDiff = frameLocalCount = readUnsignedShort(stackMap);
								stackMap += 2;
								for(j = 0; n > 0; n--)
									{
									stackMap = readFrameType(frameLocal,
									                         j++,
									                         stackMap,
									                         c,
									                         labels);
									}
								n = frameStackCount = readUnsignedShort(stackMap);
								stackMap += 2;
								for(j = 0; n > 0; n--)
									{
									stackMap = readFrameType(frameStack,
									                         j++,
									                         stackMap,
									                         c,
									                         labels);
									}
								}
							}
						frameOffset += delta + 1;
						if(labels[frameOffset] == null)
							{
							labels[frameOffset] = new Label();
							}

						--frameCount;
						}
					else
						{
						frameLocal = null;
						}
					}

				int opcode = b[v] & 0xFF;
				switch(ClassWriter.TYPE[opcode])
					{
					case ClassWriter.NOARG_INSN:
						mv.visitInsn(opcode);
						v += 1;
						break;
					case ClassWriter.IMPLVAR_INSN:
						if(opcode > Opcodes.ISTORE)
							{
							opcode -= 59; // ISTORE_0
							mv.visitVarInsn(Opcodes.ISTORE + (opcode >> 2),
							                opcode & 0x3);
							}
						else
							{
							opcode -= 26; // ILOAD_0
							mv.visitVarInsn(Opcodes.ILOAD + (opcode >> 2),
							                opcode & 0x3);
							}
						v += 1;
						break;
					case ClassWriter.LABEL_INSN:
						mv.visitJumpInsn(opcode, labels[w
						                                + readShort(v + 1)]);
						v += 3;
						break;
					case ClassWriter.LABELW_INSN:
						mv.visitJumpInsn(opcode - 33, labels[w
						                                     + readInt(v + 1)]);
						v += 5;
						break;
					case ClassWriter.WIDE_INSN:
						opcode = b[v + 1] & 0xFF;
						if(opcode == Opcodes.IINC)
							{
							mv.visitIincInsn(readUnsignedShort(v + 2),
							                 readShort(v + 4));
							v += 6;
							}
						else
							{
							mv.visitVarInsn(opcode,
							                readUnsignedShort(v + 2));
							v += 4;
							}
						break;
					case ClassWriter.TABL_INSN:
						// skips 0 to 3 padding bytes
						v = v + 4 - (w & 3);
						// reads instruction
						label = w + readInt(v);
						int min = readInt(v + 4);
						int max = readInt(v + 8);
						v += 12;
						Label[] table = new Label[max - min + 1];
						for(j = 0; j < table.length; ++j)
							{
							table[j] = labels[w + readInt(v)];
							v += 4;
							}
						mv.visitTableSwitchInsn(min,
						                        max,
						                        labels[label],
						                        table);
						break;
					case ClassWriter.LOOK_INSN:
						// skips 0 to 3 padding bytes
						v = v + 4 - (w & 3);
						// reads instruction
						label = w + readInt(v);
						j = readInt(v + 4);
						v += 8;
						int[] keys = new int[j];
						Label[] values = new Label[j];
						for(j = 0; j < keys.length; ++j)
							{
							keys[j] = readInt(v);
							values[j] = labels[w + readInt(v + 4)];
							v += 8;
							}
						mv.visitLookupSwitchInsn(labels[label],
						                         keys,
						                         values);
						break;
					case ClassWriter.VAR_INSN:
						mv.visitVarInsn(opcode, b[v + 1] & 0xFF);
						v += 2;
						break;
					case ClassWriter.SBYTE_INSN:
						mv.visitIntInsn(opcode, b[v + 1]);
						v += 2;
						break;
					case ClassWriter.SHORT_INSN:
						mv.visitIntInsn(opcode, readShort(v + 1));
						v += 3;
						break;
					case ClassWriter.LDC_INSN:
						mv.visitLdcInsn(readConst(b[v + 1] & 0xFF, c));
						v += 2;
						break;
					case ClassWriter.LDCW_INSN:
						mv.visitLdcInsn(readConst(readUnsignedShort(v + 1),
						                          c));
						v += 3;
						break;
					case ClassWriter.FIELDORMETH_INSN:
					case ClassWriter.ITFMETH_INSN:
						int cpIndex = items[readUnsignedShort(v + 1)];
						String iowner = readClass(cpIndex, c);
						cpIndex = items[readUnsignedShort(cpIndex + 2)];
						String iname = readUTF8(cpIndex, c);
						String idesc = readUTF8(cpIndex + 2, c);
						if(opcode < Opcodes.INVOKEVIRTUAL)
							{
							mv.visitFieldInsn(opcode, iowner, iname, idesc);
							}
						else
							{
							mv.visitMethodInsn(opcode, iowner, iname, idesc);
							}
						if(opcode == Opcodes.INVOKEINTERFACE)
							{
							v += 5;
							}
						else
							{
							v += 3;
							}
						break;
					case ClassWriter.TYPE_INSN:
						mv.visitTypeInsn(opcode, readClass(v + 1, c));
						v += 3;
						break;
					case ClassWriter.IINC_INSN:
						mv.visitIincInsn(b[v + 1] & 0xFF, b[v + 2]);
						v += 3;
						break;
						// case MANA_INSN:
					default:
						mv.visitMultiANewArrayInsn(readClass(v + 1, c),
						                           b[v + 3] & 0xFF);
						v += 4;
						break;
					}
				}
			l = labels[codeEnd - codeStart];
			if(l != null)
				{
				mv.visitLabel(l);
				}
			// visits the local variable tables
			if(!skipDebug && varTable != 0)
				{
				int[] typeTable = null;
				if(varTypeTable != 0)
					{
					k = readUnsignedShort(varTypeTable) * 3;
					w = varTypeTable + 2;
					typeTable = new int[k];
					while(k > 0)
						{
						typeTable[--k] = w + 6; // signature
						typeTable[--k] = readUnsignedShort(w + 8); // index
						typeTable[--k] = readUnsignedShort(w); // start
						w += 10;
						}
					}
				k = readUnsignedShort(varTable);
				w = varTable + 2;
				for(; k > 0; --k)
					{
					int start = readUnsignedShort(w);
					int length = readUnsignedShort(w + 2);
					int index = readUnsignedShort(w + 8);
					String vsignature = null;
					if(typeTable != null)
						{
						for(int a = 0; a < typeTable.length; a += 3)
							{
							if(typeTable[a] == start
							   && typeTable[a + 1] == index)
								{
								vsignature = readUTF8(typeTable[a + 2], c);
								break;
								}
							}
						}
					mv.visitLocalVariable(readUTF8(w + 4, c),
					                      readUTF8(w + 6, c),
					                      vsignature,
					                      labels[start],
					                      labels[start + length],
					                      index);
					w += 10;
					}
				}
			// visits the other attributes
			while(cattrs != null)
				{
				attr = cattrs.next;
				cattrs.next = null;
				mv.visitAttribute(cattrs);
				cattrs = attr;
				}
			// visits the max stack and max locals values
			mv.visitMaxs(maxStack, maxLocals);
			}

		if(mv != null)
			{
			mv.visitEnd();
			}
		}

	// visits the end of the class
	classVisitor.visitEnd();
}

/**
 * Reads parameter annotations and makes the given visitor visit them.
 *
 * @param v       start offset in {@link #b b} of the annotations to be read.
 * @param buf     buffer to be used to call {@link #readUTF8 readUTF8},
 *                {@link #readClass(int,char[]) readClass} or
 *                {@link #readConst readConst}.
 * @param visible <tt>true</tt> if the annotations to be read are visible
 *                at runtime.
 * @param mv      the visitor that must visit the annotations.
 */
private void readParameterAnnotations(
		int v,
		final char[] buf,
		final boolean visible,
		final MethodVisitor mv){
	int n = b[v++] & 0xFF;
	for(int i = 0; i < n; ++i)
		{
		int j = readUnsignedShort(v);
		v += 2;
		for(; j > 0; --j)
			{
			v = readAnnotationValues(v + 2,
			                         buf,
			                         true,
			                         mv.visitParameterAnnotation(i,
			                                                     readUTF8(v, buf),
			                                                     visible));
			}
		}
}

/**
 * Reads the values of an annotation and makes the given visitor visit them.
 *
 * @param v     the start offset in {@link #b b} of the values to be read
 *              (including the unsigned short that gives the number of values).
 * @param buf   buffer to be used to call {@link #readUTF8 readUTF8},
 *              {@link #readClass(int,char[]) readClass} or
 *              {@link #readConst readConst}.
 * @param named if the annotation values are named or not.
 * @param av    the visitor that must visit the values.
 * @return the end offset of the annotation values.
 */
private int readAnnotationValues(
		int v,
		final char[] buf,
		final boolean named,
		final AnnotationVisitor av){
	int i = readUnsignedShort(v);
	v += 2;
	if(named)
		{
		for(; i > 0; --i)
			{
			v = readAnnotationValue(v + 2, buf, readUTF8(v, buf), av);
			}
		}
	else
		{
		for(; i > 0; --i)
			{
			v = readAnnotationValue(v, buf, null, av);
			}
		}
	if(av != null)
		{
		av.visitEnd();
		}
	return v;
}

/**
 * Reads a value of an annotation and makes the given visitor visit it.
 *
 * @param v    the start offset in {@link #b b} of the value to be read (<i>not
 *             including the value name constant pool index</i>).
 * @param buf  buffer to be used to call {@link #readUTF8 readUTF8},
 *             {@link #readClass(int,char[]) readClass} or
 *             {@link #readConst readConst}.
 * @param name the name of the value to be read.
 * @param av   the visitor that must visit the value.
 * @return the end offset of the annotation value.
 */
private int readAnnotationValue(
		int v,
		final char[] buf,
		final String name,
		final AnnotationVisitor av){
	int i;
	if(av == null)
		{
		switch(b[v] & 0xFF)
			{
			case'e': // enum_const_value
				return v + 5;
			case'@': // annotation_value
				return readAnnotationValues(v + 3, buf, true, null);
			case'[': // array_value
				return readAnnotationValues(v + 1, buf, false, null);
			default:
				return v + 3;
			}
		}
	switch(b[v++] & 0xFF)
		{
		case'I': // pointer to CONSTANT_Integer
		case'J': // pointer to CONSTANT_Long
		case'F': // pointer to CONSTANT_Float
		case'D': // pointer to CONSTANT_Double
			av.visit(name, readConst(readUnsignedShort(v), buf));
			v += 2;
			break;
		case'B': // pointer to CONSTANT_Byte
			av.visit(name,
			         new Byte((byte) readInt(items[readUnsignedShort(v)])));
			v += 2;
			break;
		case'Z': // pointer to CONSTANT_Boolean
			av.visit(name, readInt(items[readUnsignedShort(v)]) == 0
			               ? Boolean.FALSE
			               : Boolean.TRUE);
			v += 2;
			break;
		case'S': // pointer to CONSTANT_Short
			av.visit(name,
			         new Short((short) readInt(items[readUnsignedShort(v)])));
			v += 2;
			break;
		case'C': // pointer to CONSTANT_Char
			av.visit(name,
			         new Character((char) readInt(items[readUnsignedShort(v)])));
			v += 2;
			break;
		case's': // pointer to CONSTANT_Utf8
			av.visit(name, readUTF8(v, buf));
			v += 2;
			break;
		case'e': // enum_const_value
			av.visitEnum(name, readUTF8(v, buf), readUTF8(v + 2, buf));
			v += 4;
			break;
		case'c': // class_info
			av.visit(name, Type.getType(readUTF8(v, buf)));
			v += 2;
			break;
		case'@': // annotation_value
			v = readAnnotationValues(v + 2,
			                         buf,
			                         true,
			                         av.visitAnnotation(name, readUTF8(v, buf)));
			break;
		case'[': // array_value
			int size = readUnsignedShort(v);
			v += 2;
			if(size == 0)
				{
				return readAnnotationValues(v - 2,
				                            buf,
				                            false,
				                            av.visitArray(name));
				}
			switch(this.b[v++] & 0xFF)
				{
				case'B':
					byte[] bv = new byte[size];
					for(i = 0; i < size; i++)
						{
						bv[i] = (byte) readInt(items[readUnsignedShort(v)]);
						v += 3;
						}
					av.visit(name, bv);
					--v;
					break;
				case'Z':
					boolean[] zv = new boolean[size];
					for(i = 0; i < size; i++)
						{
						zv[i] = readInt(items[readUnsignedShort(v)]) != 0;
						v += 3;
						}
					av.visit(name, zv);
					--v;
					break;
				case'S':
					short[] sv = new short[size];
					for(i = 0; i < size; i++)
						{
						sv[i] = (short) readInt(items[readUnsignedShort(v)]);
						v += 3;
						}
					av.visit(name, sv);
					--v;
					break;
				case'C':
					char[] cv = new char[size];
					for(i = 0; i < size; i++)
						{
						cv[i] = (char) readInt(items[readUnsignedShort(v)]);
						v += 3;
						}
					av.visit(name, cv);
					--v;
					break;
				case'I':
					int[] iv = new int[size];
					for(i = 0; i < size; i++)
						{
						iv[i] = readInt(items[readUnsignedShort(v)]);
						v += 3;
						}
					av.visit(name, iv);
					--v;
					break;
				case'J':
					long[] lv = new long[size];
					for(i = 0; i < size; i++)
						{
						lv[i] = readLong(items[readUnsignedShort(v)]);
						v += 3;
						}
					av.visit(name, lv);
					--v;
					break;
				case'F':
					float[] fv = new float[size];
					for(i = 0; i < size; i++)
						{
						fv[i] = Float.intBitsToFloat(readInt(items[readUnsignedShort(v)]));
						v += 3;
						}
					av.visit(name, fv);
					--v;
					break;
				case'D':
					double[] dv = new double[size];
					for(i = 0; i < size; i++)
						{
						dv[i] = Double.longBitsToDouble(readLong(items[readUnsignedShort(v)]));
						v += 3;
						}
					av.visit(name, dv);
					--v;
					break;
				default:
					v = readAnnotationValues(v - 3,
					                         buf,
					                         false,
					                         av.visitArray(name));
				}
		}
	return v;
}

private int readFrameType(
		final Object[] frame,
		final int index,
		int v,
		final char[] buf,
		final Label[] labels){
	int type = b[v++] & 0xFF;
	switch(type)
		{
		case 0:
			frame[index] = Opcodes.TOP;
			break;
		case 1:
			frame[index] = Opcodes.INTEGER;
			break;
		case 2:
			frame[index] = Opcodes.FLOAT;
			break;
		case 3:
			frame[index] = Opcodes.DOUBLE;
			break;
		case 4:
			frame[index] = Opcodes.LONG;
			break;
		case 5:
			frame[index] = Opcodes.NULL;
			break;
		case 6:
			frame[index] = Opcodes.UNINITIALIZED_THIS;
			break;
		case 7: // Object
			frame[index] = readClass(v, buf);
			v += 2;
			break;
		default: // Uninitialized
			int offset = readUnsignedShort(v);
			if(labels[offset] == null)
				{
				labels[offset] = new Label();
				}
			frame[index] = labels[offset];
			v += 2;
		}
	return v;
}

/**
 * Reads an attribute in {@link #b b}.
 *
 * @param attrs   prototypes of the attributes that must be parsed during the
 *                visit of the class. Any attribute whose type is not equal to the
 *                type of one the prototypes is ignored (i.e. an empty
 *                {@link Attribute} instance is returned).
 * @param type    the type of the attribute.
 * @param off     index of the first byte of the attribute's content in
 *                {@link #b b}. The 6 attribute header bytes, containing the type
 *                and the length of the attribute, are not taken into account here
 *                (they have already been read).
 * @param len     the length of the attribute's content.
 * @param buf     buffer to be used to call {@link #readUTF8 readUTF8},
 *                {@link #readClass(int,char[]) readClass} or
 *                {@link #readConst readConst}.
 * @param codeOff index of the first byte of code's attribute content in
 *                {@link #b b}, or -1 if the attribute to be read is not a code
 *                attribute. The 6 attribute header bytes, containing the type and
 *                the length of the attribute, are not taken into account here.
 * @param labels  the labels of the method's code, or <tt>null</tt> if the
 *                attribute to be read is not a code attribute.
 * @return the attribute that has been read, or <tt>null</tt> to skip this
 *         attribute.
 */
private Attribute readAttribute(
		final Attribute[] attrs,
		final String type,
		final int off,
		final int len,
		final char[] buf,
		final int codeOff,
		final Label[] labels){
	for(int i = 0; i < attrs.length; ++i)
		{
		if(attrs[i].type.equals(type))
			{
			return attrs[i].read(this, off, len, buf, codeOff, labels);
			}
		}
	return new Attribute(type).read(this, off, len, null, -1, null);
}

// ------------------------------------------------------------------------
// Utility methods: low level parsing
// ------------------------------------------------------------------------

/**
 * Returns the start index of the constant pool item in {@link #b b}, plus
 * one. <i>This method is intended for {@link Attribute} sub classes, and is
 * normally not needed by class generators or adapters.</i>
 *
 * @param item the index a constant pool item.
 * @return the start index of the constant pool item in {@link #b b}, plus
 *         one.
 */
public int getItem(final int item){
	return items[item];
}

/**
 * Reads a byte value in {@link #b b}. <i>This method is intended for
 * {@link Attribute} sub classes, and is normally not needed by class
 * generators or adapters.</i>
 *
 * @param index the start index of the value to be read in {@link #b b}.
 * @return the read value.
 */
public int readByte(final int index){
	return b[index] & 0xFF;
}

/**
 * Reads an unsigned short value in {@link #b b}. <i>This method is
 * intended for {@link Attribute} sub classes, and is normally not needed by
 * class generators or adapters.</i>
 *
 * @param index the start index of the value to be read in {@link #b b}.
 * @return the read value.
 */
public int readUnsignedShort(final int index){
	byte[] b = this.b;
	return ((b[index] & 0xFF) << 8) | (b[index + 1] & 0xFF);
}

/**
 * Reads a signed short value in {@link #b b}. <i>This method is intended
 * for {@link Attribute} sub classes, and is normally not needed by class
 * generators or adapters.</i>
 *
 * @param index the start index of the value to be read in {@link #b b}.
 * @return the read value.
 */
public short readShort(final int index){
	byte[] b = this.b;
	return (short) (((b[index] & 0xFF) << 8) | (b[index + 1] & 0xFF));
}

/**
 * Reads a signed int value in {@link #b b}. <i>This method is intended for
 * {@link Attribute} sub classes, and is normally not needed by class
 * generators or adapters.</i>
 *
 * @param index the start index of the value to be read in {@link #b b}.
 * @return the read value.
 */
public int readInt(final int index){
	byte[] b = this.b;
	return ((b[index] & 0xFF) << 24) | ((b[index + 1] & 0xFF) << 16)
	       | ((b[index + 2] & 0xFF) << 8) | (b[index + 3] & 0xFF);
}

/**
 * Reads a signed long value in {@link #b b}. <i>This method is intended
 * for {@link Attribute} sub classes, and is normally not needed by class
 * generators or adapters.</i>
 *
 * @param index the start index of the value to be read in {@link #b b}.
 * @return the read value.
 */
public long readLong(final int index){
	long l1 = readInt(index);
	long l0 = readInt(index + 4) & 0xFFFFFFFFL;
	return (l1 << 32) | l0;
}

/**
 * Reads an UTF8 string constant pool item in {@link #b b}. <i>This method
 * is intended for {@link Attribute} sub classes, and is normally not needed
 * by class generators or adapters.</i>
 *
 * @param index the start index of an unsigned short value in {@link #b b},
 *              whose value is the index of an UTF8 constant pool item.
 * @param buf   buffer to be used to read the item. This buffer must be
 *              sufficiently large. It is not automatically resized.
 * @return the String corresponding to the specified UTF8 item.
 */
public String readUTF8(int index, final char[] buf){
	int item = readUnsignedShort(index);
	String s = strings[item];
	if(s != null)
		{
		return s;
		}
	index = items[item];
	return strings[item] = readUTF(index + 2, readUnsignedShort(index), buf);
}

/**
 * Reads UTF8 string in {@link #b b}.
 *
 * @param index  start offset of the UTF8 string to be read.
 * @param utfLen length of the UTF8 string to be read.
 * @param buf    buffer to be used to read the string. This buffer must be
 *               sufficiently large. It is not automatically resized.
 * @return the String corresponding to the specified UTF8 string.
 */
private String readUTF(int index, final int utfLen, final char[] buf){
	int endIndex = index + utfLen;
	byte[] b = this.b;
	int strLen = 0;
	int c, d, e;
	while(index < endIndex)
		{
		c = b[index++] & 0xFF;
		switch(c >> 4)
			{
			case 0:
			case 1:
			case 2:
			case 3:
			case 4:
			case 5:
			case 6:
			case 7:
				// 0xxxxxxx
				buf[strLen++] = (char) c;
				break;
			case 12:
			case 13:
				// 110x xxxx 10xx xxxx
				d = b[index++];
				buf[strLen++] = (char) (((c & 0x1F) << 6) | (d & 0x3F));
				break;
			default:
				// 1110 xxxx 10xx xxxx 10xx xxxx
				d = b[index++];
				e = b[index++];
				buf[strLen++] = (char) (((c & 0x0F) << 12)
				                        | ((d & 0x3F) << 6) | (e & 0x3F));
				break;
			}
		}
	return new String(buf, 0, strLen);
}

/**
 * Reads a class constant pool item in {@link #b b}. <i>This method is
 * intended for {@link Attribute} sub classes, and is normally not needed by
 * class generators or adapters.</i>
 *
 * @param index the start index of an unsigned short value in {@link #b b},
 *              whose value is the index of a class constant pool item.
 * @param buf   buffer to be used to read the item. This buffer must be
 *              sufficiently large. It is not automatically resized.
 * @return the String corresponding to the specified class item.
 */
public String readClass(final int index, final char[] buf){
	// computes the start index of the CONSTANT_Class item in b
	// and reads the CONSTANT_Utf8 item designated by
	// the first two bytes of this CONSTANT_Class item
	return readUTF8(items[readUnsignedShort(index)], buf);
}

/**
 * Reads a numeric or string constant pool item in {@link #b b}. <i>This
 * method is intended for {@link Attribute} sub classes, and is normally not
 * needed by class generators or adapters.</i>
 *
 * @param item the index of a constant pool item.
 * @param buf  buffer to be used to read the item. This buffer must be
 *             sufficiently large. It is not automatically resized.
 * @return the {@link Integer}, {@link Float}, {@link Long},
 *         {@link Double}, {@link String} or {@link Type} corresponding to
 *         the given constant pool item.
 */
public Object readConst(final int item, final char[] buf){
	int index = items[item];
	switch(b[index - 1])
		{
		case ClassWriter.INT:
			return new Integer(readInt(index));
		case ClassWriter.FLOAT:
			return new Float(Float.intBitsToFloat(readInt(index)));
		case ClassWriter.LONG:
			return new Long(readLong(index));
		case ClassWriter.DOUBLE:
			return new Double(Double.longBitsToDouble(readLong(index)));
		case ClassWriter.CLASS:
			String s = readUTF8(index, buf);
			return s.charAt(0) == '['
			       ? Type.getType(s)
			       : Type.getObjectType(s);
			// case ClassWriter.STR:
		default:
			return readUTF8(index, buf);
		}
}
}
